I also have 9.29 ROM, and the answer is not in index, cause the first step IMO should be to install TWRP recovery. And The All in One Tool is described as only for android 5 and aboveQuick answer is you'll most likely have to reflash your device (good starting point [THREAD="2961145"]here[/THREAD]).
So, again - how can we move from that strange ROM to newer versions?
So, I'll aswer myself, in case there is another one with such old ROM.
Problem solved, found a way to upgrade to Lolipop. Thanks to user craagz, who wrote this tutorial (just erase spaces in http).
Next I have installed official 2.13 ROM (nubia updater made resize of patitions) - it's lolipop 5.0.0.
One thing - USB debugging must be switched off
Next step - from stock recovery from ROM 2.13 directly installed newest official ROM-3.77 - lolipop 5.1.1, and with tigreos tutorial from needrom/ and rooted and gapps.
That end I just have to configure apps and make LTE works